What happens to my Outlook 2003 clients when I upgrade Exchange from 2003 to 2010 (SP1)

sjvtech
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I have a single Exchange 2003 SP2 server and I am not planning the transition to 2010.

I am following Microsoft's guide to doing this process and it is very straightforward. I understand that I will still need personal folders, I know about the RPC issue but that it is resolved in SP1 which is why I'm using it (plus all of my clients use Cached mode anyway). However it doesn't answer a question that I am curious about.

I am building a new email server for Exchange 2010 as required and thus at the appointed time in the process I will transfer all of my mailboxes all at once from the 2003 Exchange Server to the 2010 exchange server.

All of my mail clients are Outlook 2003 and of course were configured to connect to the existing 2003 Exchange server. When I start moving mailboxes, what will happen to these clients.

The documentation I'm reading doesn't seem to really address this. Will the Outlook 2003 clients just know and understand that they need to connect to a new server? Will I need to go through and reconfigure them all?

In addition to this when I start this transfer will it take all of the mailboxes offline all at once, or will it do them one at a time, and as mailboxes are transferring, if users are connected via Outlook, what will happen to them.
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Commented:
When moving to ex2010 the mailbox move is done online except for the final phase which will actually disconnect the mailbox while it does the final sync. The end user if connected to outlook at the time will get a pop up saying they must restart outlook, they restart and they are connected to the new server.
mailboxes will be moved 2  at a time by defualt, ( you can change this by editing the MSExchangeMailboxReplication.exe.config file)

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Commented:
Just to clarify, Outlook doesn't need to be told to connect to a new mail server or anything like that?

Also just out of curiosity, if I wanted to change the server name of the new 2010 server later to be the name of the old (decommissioned) server, would that affect the clients.

Author

Commented:
nevermind on that second part, I'll ask that a different way in a different question as it's part of a larger issue. I'll just take the clarification on outlook.

Commented:
Nope, it does not matter whether they are connected via OWA or RPC over HTTP, they will be notified to either close outlook and re-open, or if they are using webmail, they will have to log out then log in, and they will be pointing at the correct server.
They would be notified by the autodiscover service of where they needed to connect to.
Changing the name would best be done by using the DAG feature in 2k10.
After bringing the 2k10 1st box online, and verifying that everything is working then, uninstall ex2k3, remove from domain.
Then build new 2k10 server with old 2k3 server  name and make it part of the DAG

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